Year: 2022
Type: article
Abstract: This paper presents a report about the extraction of resveratrol with ethanol (EtOH) from red grape pomace (RGP) Vitis vinifera L. (Cluj, Transylvania region, Romania) and obtaining a dietary supplement with zinc on grape pomace support. The concentration of resveratrol (Rv) from the extract was spectrophotometrically determined at 305 nm wavelength, and was found to be 145 mg Rv/L. The material resulting after the extraction of resveratrol was processed to obtain a zinc dietary supplement support. The thermodynamic parameters, including Gibbs free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) of Zn2+ biosorption were calculated and the results indicate that the process is endothermic and spontaneous. The Zn2+ biosorption kinetics was analysed using pseudo-first- and pseudo-second-order models. The results indicate that biosorption of Zn2+ aqueous solution onto grape pomace support is best described by the pseudo-second-order model.
Authors: Silvia BURCĂ, Cerasella INDOLEAN
Institution: Babeș-Bolyai University
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4302290657